According to the Kansas City Star, Teasdale died from complications of pneumonia.

After leaving public office in 1981, he went to Kansas City to practice law.

"As a personal friend of Joe's, I'm pained at the loss we have all just experienced,” said Jackson County Democratic Chair Tom Wyrsch, in a statement. “He set an example of leadership, dedication to his community and integrity that has greatly improved our state. He will be missed."